diff --git a/lib/Config.js b/lib/Config.js
index 67ae638a8..18fcdbc1a 100644
--- a/lib/Config.js
+++ b/lib/Config.js
@@ -32,9 +32,10 @@ exports.settings = {
   no_answer_timeout              : 60,
 
   // Registration parameters.
-  register         : true,
-  register_expires : 600,
-  registrar_server : null,
+  register                : true,
+  register_expires        : 600,
+  register_from_tag_trail : '',
+  registrar_server        : null,
 
   // Connection options.
   sockets                          : null,
@@ -282,6 +283,16 @@ const checks = {
       }
     },
 
+    register_from_tag_trail(register_from_tag_trail)
+    {
+      if (typeof register_from_tag_trail === 'function')
+      {
+        return register_from_tag_trail;
+      }
+
+      return String(register_from_tag_trail);
+    },
+
     registrar_server(registrar_server)
     {
       if (!/^sip:/i.test(registrar_server))
diff --git a/lib/Registrator.js b/lib/Registrator.js
index 2c889741e..f47114902 100644
--- a/lib/Registrator.js
+++ b/lib/Registrator.js
@@ -49,7 +49,7 @@ module.exports = class Registrator
 
     // Contents of the sip.instance Contact header parameter.
     this._sipInstance = `"<urn:uuid:${this._ua.configuration.instance_id}>"`;
-    
+
     this._contact += `;reg-id=${this._reg_id}`;
     this._contact += `;+sip.instance=${this._sipInstance}`;
   }
@@ -109,11 +109,26 @@ module.exports = class Registrator
 ${this._contact};expires=${this._expires}${this._extraContactParams}`);
     extraHeaders.push(`Expires: ${this._expires}`);
 
+    let fromTag = Utils.newTag();
+
+    if (this._ua.configuration.register_from_tag_trail)
+    {
+      if (typeof this._ua.configuration.register_from_tag_trail === 'function')
+      {
+        fromTag += this._ua.configuration.register_from_tag_trail();
+      }
+      else
+      {
+        fromTag += this._ua.configuration.register_from_tag_trail;
+      }
+    }
+
     const request = new SIPMessage.OutgoingRequest(
       JsSIP_C.REGISTER, this._registrar, this._ua, {
-        'to_uri'  : this._to_uri,
-        'call_id' : this._call_id,
-        'cseq'    : (this._cseq += 1)
+        'to_uri'   : this._to_uri,
+        'call_id'  : this._call_id,
+        'cseq'     : (this._cseq += 1),
+        'from_tag' : fromTag
       }, extraHeaders);
 
     const request_sender = new RequestSender(this._ua, request, {
diff --git a/lib/UA.d.ts b/lib/UA.d.ts
index b7db28e83..efc451ba1 100644
--- a/lib/UA.d.ts
+++ b/lib/UA.d.ts
@@ -40,6 +40,7 @@ export interface UAConfiguration {
   ha1?: string;
   register?: boolean;
   register_expires?: number;
+  register_from_tag_trail?: string | function() : string;
   registrar_server?: string;
   use_preloaded_route?: boolean;
   user_agent?: string;